Impact of the Compaction Method Applied on Selected Characteristics of Cold Recycled Asphalt Mixes

The quality of cold recycled asphalt mixes in most European countries is currently characterized primarily by indirect tensile strength or stiffness assessed after the defined curing period. These characteristics are usually supplemented by residual values of both parameters after immersion in water. This way of assessing quality empirically is very simple, fast, and well-established. Conversely, it also has some unnoticed weaknesses. A major disadvantage is probably the strong dependency on various factors like, e.g., the method of test specimen compaction. Technical specifications in different European countries prescribe the preparation of test specimens by using different equipment that is based on static, dynamic, or slow rotational compaction (gyratory compactor). The laboratory compaction method applied naturally affects bulk density and voids content, thus directly influencing the values of indirect strength or stiffness modulus as well. This paper focuses on the assessment of cylindrical test specimen preparation and its effect on quality determination for cold recycled asphalt mixes. The specimens were prepared by a static pressure compacting machine, Marshall hammer and gyratory compactor. Two mixes were used, one of them containing bituminous emulsion and the other one with bituminous foam, whereas the cement content was identical.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 24-31
  • Monograph Title: Advanced Characterization of Asphalt and Concrete Materials

Subject/Index Terms

Filing Info

  • Accession Number: 01537194
  • Record Type: Publication
  • ISBN: 9780784478554
  • Files: TRIS, ASCE
  • Created Date: Jul 22 2014 3:02PM